11

9125I–RKE–09/10

Atmel ATA5279

The suggested waiting time is calculated as follows:

The sequence above is an example of how the failure illustrated in Figure 3-4 on page 10

could be detected. Depending on the grade of detection detail that is required, a matrix for the

test sequence should be set up to find the most effective way of programming and testing. For

more details on the commands, please refer also to Section 3.9.2 “General Command

Description” on page 21.

Table 3-2.

Sequence for Example 1, Using the Diagnosis Mode

Step

Command

I/O

Coding

Actions/Remarks

1

Select Driver

I

00101001 – 29h

Selects driver 1 with Diagnosis Mode enabled

2Get Driver Setup

I

O

01101000 – 68h

00000001 – 01h

Reads back active driver info:

Channel 1 active, both lines return a 0

3

Select Driver

I

00101010 – 2Ah

Selects driver 2 with Diagnosis Mode enabled

4Get Driver Setup

I

O

01101000 – 68h

00000010 – 02h

Reads back active driver info:

Channel 2 active, both lines return a 0

5

Set Coil Current

I

10100001 – A1h

Closes test switches S_H2P and S_L2N

Note:

S_L2P and S_H2N are then open

6

- no command -

Wait for the test structures to stabilize in the new setting, see

below

7Get Driver Setup

I

O

01101000 – 68h

00000010 – 02h

Reads back active driver info:

Channel 2 active, but both lines return a 0

8

Select Driver

I

00101001 – 29h

Selects driver 1 with Diagnosis Mode enabled

9

Set Coil Current

I

10100001 – A1h

Closes test switches S_H1P and S_L1N (Note: S_L1P and

S_H1N are then open)

10

- no command -

Wait for the test structures to stabilize in the new setting, see

below

11

Get Driver Setup

I

O

01101000 – 68h

00001001 – 09h

Reads back active driver info:

Channel 1 active and A1P returns a 1

12

Select Driver

I

00101010 – 2Ah

Selects driver 2 with Diagnosis Mode enabled

13

Set Coil Current

I

10100000 – A0h

Closes test switches S_L2P and S_L2N

Note:

S_H2P and S_H2N are then open

14

- no command -

Wait for the test structures to stabilize in the new setting, see

below

15

Get Driver Setup

I

O

01101000 – 68h

00000010 – 02h

Reads back active driver info:

Channel 2 active and A2P returns a 1

Note:

Steps 6, 10 and 14 are wait states, as the test structures need some time to stabilize in their new setting. This depends mainly

on the externally applied capacitors on the AxP and the AxN pins.

t

diag,wait

2V

S

×

C

e

C

ant

+

()

×

300 µA

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